Let’s break down the usual suspects.

Plastic (Tritan or BPA‑free)
Cheap, light, and nearly unbreakable. If you drop it at the gym, no big deal. It's clear so you can see how much water is left. And it's everywhere.

But plastic scratches easily, and those scratches trap bacteria. Over time, it can hold onto smells no matter how much you scrub. Also, even BPA‑free plastic can leach microplastics if left in a hot car. Not ideal if you're paranoid about that stuff.

Verdict: Great for casual use, short workouts, or if you're on a budget. Replace it every year or so.

Stainless Steel
Tough, insulated, and doesn't hold odours. It keeps cold drinks cold and hot drinks hot for hours. No weird plastic taste. And it's practically indestructible.

The downside? It's heavier. Not great if you're running with it. You can't see how much is left. And it's pricier. Also, if you drop it hard enough, the vacuum insulation can break and it won't keep temperature anymore.

Verdict: Best for commuting, office, hiking, or anyone who wants temperature control. Worth the extra cash.

Glass
Purest taste, no chemicals, easy to clean, and you can see everything inside. Great for juices or smoothies.

But it's heavy and fragile. One drop and it's gone. Also, most glass bottles come with silicone sleeves, which add bulk. Not really gym-friendly unless you're doing yoga and moving slowly.

Verdict: Perfect for desk work or home use. Not for the clumsy or the active.

Aluminium
Light and sleek. Often colourful.

But most aluminium bottles have a lining inside (because aluminium reacts with acidic drinks). That lining can peel over time. And if it's not lined well, your water gets a metallic taste. Honestly, they're a bit outdated now that stainless steel exists.

Verdict: Skip it. Stainless does everything better.

So which one should you buy?

Ask yourself three questions:

• Do I need temperature control? → Stainless steel.

• Am I clumsy or do I workout hard? → Plastic (Tritan) is safer.

• Do I care most about taste and purity? → Glass, but keep it on your desk.

• Do I want one bottle for everything? → Stainless steel is the most versatile.

Don't overthink it. A cheap plastic bottle that you actually use every day beats an expensive titanium one that sits in your cupboard. The best material is the one that fits your routine and gets you to drink more water.

That's it. Pick one, fill it up, and go.